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[compiler-rt builtins] Assert that atomic.c can be compiled correctly.

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The spinlock requires that lock-free operations are available;
otherwise, the implementation just calls itself. As discussed in
D120026.

Differential Revision: https://reviews.llvm.org/D123080
This commit is contained in:
Eli Friedman 2022-05-16 14:40:57 -07:00
parent ee8aa351e4
commit dd20323f51
1 changed files with 2 additions and 0 deletions
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compiler-rt/lib/builtins/atomic.c
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@ -92,6 +92,8 @@ __inline static void lock(Lock *l) { OSSpinLockLock(l); }
static Lock locks[SPINLOCK_COUNT]; // initialized to OS_SPINLOCK_INIT which is 0
#else
_Static_assert(__atomic_always_lock_free(sizeof(uintptr_t), 0),
"Implementation assumes lock-free pointer-size cmpxchg");
typedef _Atomic(uintptr_t) Lock;
/// Unlock a lock. This is a release operation.
__inline static void unlock(Lock *l) {